Here's an example of what's in the XML of one of my buttons. It doesn't look too similar or different from what you have. Does this make sense?
Quote:
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<mso:button idQ="x1:Open_1_0_9D09926" label="(01) Serial Fiction Sideshow" imageMso="AppointmentColor0" onAction="Open_1" visible="true"/>
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And so I replace Open_1 with modRibbonControl.ButtonOnAction?